An Aspergillus species (Aspergillus candidus 362) was isolated from contaminated spent Lentinus edodes compost. Using synchronous saccharification and fermentation (SSF) by the isolate and a yeast strain (Endomycopsis fibuliger 253) under solid-state conditions, the crude protein contents were increased from 24.1 to 32.3% and from 28.4 to 36.7% for Pleurotus ostreatus- and Lentinus edodes-spent-compost media, respectively. The crude fibre contents of the composts were substantially decreased. After fermentation the in vitro digestibility of crude protein was improved to 70%. The total and essential amino acid contents made up 73.3 and 37.1% of the crude protein, respectively. The fermented spent composts media were highly-nutritious fodder for poultry and animals.